Use public key encryption to digitally sign certificates for strong validation of authenticity
I think CognitiveClass.ai is great, even better than edX which I began using in 2013.
The first edX certificates were issued as digitally-signed (using public key encryption technology) PDF files. Because they were digitally signed, anyone was able to validate the certificate's authenticity in a rigorous manner, making the certificate a more trustworthy credential for employers. I think the potential was there (using this cryptographic signature) for MOOC certificates to become even more rigorously reliable (practically untamperable) than even official college transcripts.
Unfortunately, edX abandoned this feature in their certificates after 2-3 years. I've never understood why they abandoned this very attractive feature.
I'd like to see CognitiveClass.ai restore the cryptographically signed certificate feature to their certificates (and possibly also their badges through youracclaim.com).